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Stock-Based Compensation Plans (Details 3) - Performance Stock Options [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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May. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total intrinsic value of stock options exercised | $ 2.7
Total grant-date fair value of stock options vested | $ 2.6
Performance stock option activity [Roll Forward] |
Options outstanding, Beginning balance, Shares | 2.8
Options outstanding, Beginning balance, Weighted-average exercise price per share | $ 31.25
Options granted | 0.0
Options granted, Weighted-average exercise price per share | $ 0.00
Options exercised | (0.1)
Options exercised, Weighted-average exercise price per share | $ 30.17
Options forfeited | 0.0
Options forfeited, Weighted-average exercise price per share | $ 0.00
Options expired | 0.0
Options expired, Weighted-average exercise price per share | $ 0.00
Options outstanding, Ending balance, Shares | 2.7
Options outstanding, Ending balance, Weighted-average exercise price per share | $ 31.31
Options outstanding, Ending balance, Weighted-average remaining contractual term | 6 years 4 months 24 days
Options outstanding, Ending balance, Aggregate intrinsic value | $ 48.2
Options exercisable, Ending balance, Shares | 0.5
Options exercisable, Ending balance, Weighted-average exercise price per share | $ 31.20
Options exercisable, Ending balance, Weighted-average remaining contractual term | 6 years 3 months 18 days
Options exercisable, Ending balance, Aggregate intrinsic value | $ 8.6

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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